Weekly Epidemiological Record, 2006, vol. 81, 20 [full issue]

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World Health Organization. (2006). Weekly Epidemiological Record, 2006, vol. 81, 20 [full issue]. Weekly Epidemiological Record = Relevé épidémiologique hebdomadaire, 81 (20), 197 - 208. http://www.who.int/iris/handle/10665/233103